Re: Understanding IR

[ian.bird@xxxxxxx]

Hi John

First off, the port on your laptop will be IRDA not IR. IRDA is a short
range, low power high speed thingy. Your remote control is relatively
high
power long range and slowww. The two on the whole do not mix. For
remote
controls there are several 'standard' ways of encoding your binary data
including RC5, RC6 Sony PWM, Japanese etc. etc. All these though are
basically on and off pulses of IR light which can be interpreted by a
receiver. I have some references at home but they are just snippets
really.

X10 - what do you mean by remote devices? X10 works by superimposing a
small signal onto the mains at the zero crossing point of the sine
wave.
This means x10 stuff is connected by the mains and only over a
relatively
short distance without repeaters. X10 RF stuff is radio technology to
carry
the data in a very similar way to IR. The device which plugs in then
turns
this back into waves on the mains.

If you have a PC application for example this will need an interface
into
the mains to produce the x10 signal. An x10 light socket or whatever
can
then pick it up.

HTH

Ian





                                                                                                                                
                     
John
Poltorak                                                                                             
                     
<jp@xxxxxxx>           
To:      
ukha_d@xxxxxxx                                                 
                                              
cc:                                                                              
                     
17/10/02 15:43          
Subject:  [ukha_d] Understanding
IR                                              
                     
Please respond
to                                                                                         
                     
ukha_d                                                                                                    
                                                                                                                                
                                                                                                                                





Does anyone know of any good references for understanding IR?

In principle, is there any reason why I shouldn't be able to use the IR
port on my laptop as a remote control for the TV or any other device
which
which be remote controlled?


I'm also trying to figure out how X10 is supposed to be used to connect
to remote devices... Do I need some sort of converter to be able to do
this? As I understand it X10 only works across devices connected by the
mains.


--
John





http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx
Subscribe:  ukha_d-subscribe@xxxxxxx
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx
List owner:  ukha_d-owner@xxxxxxx
List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Yahoo! Groups Sponsor

ADVERTISEMENT

http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx
List of UKHA Groups here - http://groups.yahoo.com/group/UKHA_Grouplists/

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.